US20130152445A1 - Rail for inductively powering firearm accessories - Google Patents
Rail for inductively powering firearm accessories Download PDFInfo
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- US20130152445A1 US20130152445A1 US13/765,324 US201313765324A US2013152445A1 US 20130152445 A1 US20130152445 A1 US 20130152445A1 US 201313765324 A US201313765324 A US 201313765324A US 2013152445 A1 US2013152445 A1 US 2013152445A1
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- Prior art keywords
- accessory
- power
- rail
- powered rail
- firearm
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41C—SMALLARMS, e.g. PISTOLS, RIFLES; ACCESSORIES THEREFOR
- F41C27/00—Accessories; Details or attachments not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41G—WEAPON SIGHTS; AIMING
- F41G11/00—Details of sighting or aiming apparatus; Accessories
- F41G11/001—Means for mounting tubular or beam shaped sighting or aiming devices on firearms
- F41G11/003—Mountings with a dove tail element, e.g. "Picatinny rail systems"
Definitions
- Embodiments of the invention relate generally to an inductively powering rail mounted on a device such as a firearm to provide power to accessories, such as: telescopic sights, tactical sights, laser sighting modules, and night vision scopes.
- Embodiments of the present invention utilize multiple battery power sources to power multiple accessories through the use of an induction system, mounted on a standard firearms rail.
- a system for providing inductive power to an accessory on a firearm having: an inductively powering rail operatively connected to one or more batteries, the inductively powering rail comprising a plurality of inductively powering rail slots, each inductively powering rail slot having a primary U-Core, the accessory having secondary U-Cores designed to mate with each primary U-Core to provide an inductive power connection to the accessory.
- a method for providing inductive power to an accessory on a firearm including the steps of: detecting an accessory when attached to the firearm and providing an inductive power path with the accessory; and providing power to the accessory from a secondary source should power be required.
- a method for providing power to an accessory on a firearm including the steps of: detecting an accessory when attached to said firearm through actuation of a magnetic switch magnetically coupled to a magnet in the accessory via a pin located in the firearm and providing a power path with said accessory; and providing power to said accessory from a secondary source of power should power be required.
- a communication system for a powered rail of a firearm having: a powered rail operatively connected to a power supply; an accessory configured to releasably engage the powered rail; at least one pin located within the powered rail; at least one magnet, located within the accessory; at least one magnetic switch located within the powered rail, wherein the at least one pin is configured to magnetically couple the at least one magnet to the at least one magnetic switch when the accessory engages the powered rail.
- a system for a powered rail of a firearm having: a powered rail operatively connected to a power supply; an accessory configured to releasably engage the powered rail; at least one pin located within the powered rail; at least one magnet, located within the accessory; at least one magnetic switch located within the powered rail, wherein the at least one pin is configured to magnetically couple the at least one magnet to the at least one magnetic switch when the accessory engages the powered rail.
- a method for providing power to an accessory on a firearm including the steps of: detecting an accessory when attached to said firearm through actuation of a magnetic switch magnetically coupled to a magnet in the accessory via a pin located in the firearm and providing a power path with said accessory; and providing power to said accessory from a secondary source of power should power be required.
- FIG. 1 is a perspective view of an inductively powering rail mounted on a MIL-STD-1913 rail;
- FIG. 2 is cross section vertical view of a primary U-Core and a secondary U-Core
- FIG. 3 is a longitudinal cross section side view of an accessory mounted to an inductively powering rail
- FIG. 4 is a block diagram of the components of one embodiment of an inductively powered rail system
- FIG. 5 is a block diagram of a primary Printed Circuit Board (PCB) contained within an inductively powering rail;
- PCB Printed Circuit Board
- FIG. 6 is a block diagram of a PCB contained within an accessory
- FIG. 7 is a block diagram of the components of a master controller
- FIG. 8 is a flow chart of the steps of connecting an accessory to an inductively powering rail
- FIG. 9 is a flow chart of the steps for managing power usage.
- FIG. 10 is a flow chart of the steps for determining voltage and temperature of the system.
- an inductively powering rail on a firearm to power accessories such as: telescopic sights, tactical sights, laser sighting modules, Global Positioning Systems (GPS) and night vision scopes.
- This list is not meant to be exclusive, merely an example of accessories that may utilize an inductively powering rail.
- the connection between an accessory and the inductively powering rail is achieved by having electromagnets, which we refer to as “primary U-Cores” on the inductively powering rail and “secondary U-Cores” on the accessory. Once in contact with the inductively powering rail, through the use of primary and secondary U-cores, the accessory is able to obtain power through induction.
- Embodiments avoid the need for exposed electrical contacts, which may corrode or cause electrical shorting when submerged, or subjected to shock and vibration. This eliminates the need for features such as wires, pinned connections or watertight covers.
- Accessories may be attached to various fixture points on the inductively powering rail and are detected by the firearm once attached.
- the firearm will also be able to detect which accessory has been attached and the power required by the accessory.
- FIG. 1 a perspective view of an inductively powering rail mounted on a MIL-STD-1913 rail is shown generally as 10 .
- Feature 12 is a MIL-STD-1913 rail, such as a Weaver rail, NATO STANAG 4694 accessory rail or the like. Sliding over rail 12 is an inductively powering rail 14 .
- Rail 12 has a plurality of rail slots 16 and rail ribs 18 , which are utilized in receiving an accessory.
- An inductively powering rail 14 comprises a plurality of rail slots 20 , rail ribs 22 and pins 24 , in a configuration that allows for the mating of accessories with inductively powering rail 14 . It is not the intent of the inventors to restrict embodiments to a specific rail configuration, as it may be adapted to any rail configuration. The preceding serves only as an example of several embodiments to which inductively powering rail 14 may be mated. In other embodiments, the inductively powering rail 14 can be mounted to devices having apparatus adapted to receive the rail 14 .
- Pins 24 in one embodiment are stainless steel pins of grade 430 .
- pins 24 When an accessory is connected to inductively powering rail 14 , pins 24 connect to magnets 46 and trigger magnetic switch 48 (see FIG. 3 ) to indicate to the inductively powering rail 14 that an accessory has been connected. Should an accessory be removed the connection is broken and recognized by the system managing inductively powering rail 14 .
- Pins 24 are offset from the centre of inductively powering rail 14 to ensure an accessory is mounted in the correct orientation, for example a laser accessory or flashlight accessory could not be mounted backward, and point in the user's face as it would be required to connect to pins 24 , to face away from the user of the firearm.
- Pin hole 28 accepts a cross pin that locks and secures the rails 12 and 14 together.
- Primary U-Core 26 provides inductive power to an accessory when connected to inductively powering rail 14 .
- Each of primary U-core 26 and secondary U-core 50 are electromagnets.
- the wire wrappings 60 and 62 provide an electromagnetic field to permit inductive power to be transmitted bi-directionally between inductively powering rail 14 and an accessory.
- Power sources for each primary U-core 26 or secondary U-core 50 may be provided by a plurality of sources.
- a power source may be within the firearm, it may be within an accessory or it may be provided by a source such as a battery pack contained in the uniform of the user that is connected to the firearm, or by a super capacitor connected to the system. These serve as examples of diverse power sources that may be utilize by embodiments of the invention.
- Accessory 42 in this example is a lighting accessory, having a forward facing lens 44 .
- Accessory 42 connects to inductively powering rail 14 , through magnets 46 which engage pins 24 and trigger magnetic switch 48 to establish an electrical connection, via primary PCB 54 , to inductively powering rail 14 .
- connection of secondary U-core 50 and primary U-core 26 as an example of one such mating.
- This connection between U-cores 50 and 26 allows for the transmission of power to and from the system and the accessory.
- each slot provides on the order of two watts.
- PCBs Printed Circuit Boards
- the PCB for the accessory 42 is shown as accessory PCB 52 .
- the PCB for the inductively powering rail 14 is shown as primary PCB 54 .
- FIG. 4 a block diagram of the components of an inductively powered rail system is shown generally as 70 .
- Hot swap controller 74 serves to monitor and distribute power within system 70 .
- the logic of power distribution is shown in FIG. 9 .
- Hot swap controller 74 monitors power from multiple sources.
- the first in one embodiment being one or more 18.5V batteries 78 contained within the system 70 , for example in the stock or pistol grip of a firearm. This voltage has been chosen as optimal to deliver two watts to each inductively powering rail slot 20 to which an accessory 42 is connected. This power is provided through conductive power path 82 .
- a second source is an external power source 80 , for example a power supply carried external to the system by the user.
- a third source may come from accessories, which may have their own auxiliary power source 102 , i.e. they have a power source within them. When connected to the system, this feature is detected by master CPU 76 and the power source 102 may be utilized to provide power to other accessories through inductive power path 90 , should it be needed.
- conductive power path 82 powers the inductively powering rail 14 while inductive power path 90 transfers power between the inductively powering rail 14 and accessories such as 42 .
- Master CPU 76 in one embodiment is a Texas Instrument model MSP430F228, a mixed signal processor, which oversees the management of system 70 . Some of its functions include detecting when an accessory is connected or disconnected, determining the nature of an accessory, managing power usage in the system, and handling communications between the rail(s), accessories and the user.
- FIG. 4 Shown in FIG. 4 are three rails. The first being the main inductively powering rail 14 and side rail units 94 and 96 . Any number of rails may be utilized. Side rail units 94 and 96 are identical in configuration and function identically to inductively powering rail unit 14 save that they are mounted on the side of the firearm and have fewer inductively powered rail slots 20 . Side rail units 94 and 96 communicate with master CPU 76 through communications bus 110 , which also provides a path for conductive power. Communications are conducted through a control path 86 . Thus Master CPU 76 is connected to inductively powering rail 14 and through rail 14 to the microcontrollers 98 of side rails 94 and 96 .
- This connection permits the master CPU 76 to determine when an accessory has been connected, when it is disconnected, its power level and other data that may be useful to the user, such as GPS feedback or power level of an accessory or the system. Data that may be useful to a user is sent to external data transfer module 84 and displayed to the user. In addition data such as current power level, the use of an accessory power source and accessory identification may be transferred between accessories. Another example would be data indicating the range to a target which could be communicated to an accessory 42 such as a scope.
- Communications may be conducted through an inductive control path 92 .
- an accessory 42 such as an optical scope are connected to the system, it may communicate with the master CPU 76 through the use of inductive control paths 92 .
- an accessory Once a connection has been made between an accessory and an inductively powering rail 14 , 94 or 96 communication is established from each rail via frequency modulation on an inductive control path 92 , through the use of primary U-cores 26 and secondary U-Cores 50 .
- Accessories such as 42 in turn communicate with master CPU 76 through rails 14 , 94 or 96 by load modulation on the inductive control path 92 .
- a rail 14 , 94 , or 96 sends power to an accessory 42 , by turning the power on and off to the primary U-core 26 and secondary U-core 50 . This is achieved by applying a frequency on the order of 40 kHz. To communicate with an accessory 42 different frequencies may be utilized. By way of example 40 kHz and 50 kHz may be used to represent 0 and 1 respectively. By changing the frequency that the primary U-cores are turned on or off information may be sent to an accessory 42 . Types of information that may be sent by inductive control path 92 may include asking the accessory information about itself, telling the accessory to enter low power mode, ask the accessory to transfer power. The purpose here is to have a two way communication with an accessory 42 .
- FSK Frequency Shift Key Modulation
- load modulation the inventors mean monitoring the load on the system 70 . If an accessory 42 decreases or increases the amount of power it requires then master CPU 76 will adjust the power requirements as needed.
- Multi button pad 88 may reside on the firearm containing system 70 or it may reside externally. Multi button pad 88 permits the user to turn accessories on or off or to receive specific data, for example the distance to a target or the current GPS location. Multi-button pad 88 allows a user to access features the system can provide through external data transfer module 84 .
- Hot swap controller 74 serves to load the inductively powering rail 14 slowly. This reduces the amount of in rush current during power up. It also limits the amount of current that can be drawn from the inductively powering rail 14 .
- Conductive power is distributed to two main components, the inductively powering rail slots 20 and the master CPU 76 residing on PCB 54 .
- Hot swap controller 74 provides via feature 154 , voltage in the range of 14V to 22V which is sent to a MOSFET and transformer circuitry 156 for each inductively powering rail slot 20 on inductively powering rail 14 .
- Hall effect transistor 164 detects when an accessory is connected to inductively powering rail 14 and enables MOSFET driver 160 .
- Feature 180 refers to the primary U-Core 26 and the secondary U-Core 50 , establishing a power connection between inductively powering rail 14 and accessory 42 .
- High power ramp circuitry 182 slowly ramps the voltage up to high power load when power is turned on. This is necessary as some accessories such as those that utilize XEON bulbs when turned on have low resistance and they draw excessive current.
- High power load 184 is an accessory that draws more than on the order of two watts of power.
- FIG. 7 a block diagram of the components of a master controller 72 is shown (see FIG. 1 )
- Conductive power is provided from battery 78 via conductive power path 82 .
- Not swap controller 74 slowly connects the load to the inductively powering rail 14 to reduce the amount of in rush current during power up. This also allows for the limiting of the amount of current that can be drawn.
- Feature 200 is a 3.3 v DC/DC switcher, which converts the battery voltage to 3.3V to be used by the master CPU 76 .
- FIGS. 8 , 9 and 10 are flowcharts of processes that run in parallel, they each have their own independent tasks to perform. They may reside on any device but in one embodiment all would reside on master CPU 76 .
- step 308 a communication link is established between the master CPU 76 and the accessory via control inductive control path 92 . Processing then moves to step 310 where a test is made to determine if an accessory has been removed or powered off If not, processing returns to step 304 . If so, processing moves to step 312 where power to the primary and secondary U-Cores 26 and 50 for the accessory that has been removed.
- processing moves to step 326 where an external power source such as 80 (see FIG. 4 ) is utilized. Processing then returns to step 322 . If at step 324 it is found that there is no external power source, processing moves to step 328 . At step 328 a test is made to determine if there is an auxiliary power source such as feature 102 (see FIG. 4 ). If so processing moves to step 330 where the auxiliary power source is utilized. Processing then returns to step 322 . If at step 328 it is determined that there is no auxiliary power source, processing moves to step 332 . At step 332 a test is made to determine if on board power is available. On board power comprises a power device directly connected to the inductively powering rail 14 .
- step 334 the system 70 is powered by on board power. Processing then returns to step 322 . If at step 332 no on board power device is located processing moves to step 336 . At step 336 a test is made to determine if there is available power in accessories. If so, processing moves to step 338 where power is transferred to the parts of the system requiring power from the accessories. Processing then returns to step 322 . If the test at step 336 finds there is no power available, then the inductively powering rail 14 is shut down at step 340 .
- FIG. 10 is a flow chart of the steps for determining voltage and temperature of the system, shown generally as 350 . Beginning at step 352 a reading is made of the power remaining in battery 78 . The power level is then displayed to the user at step 354 . This permits the user to determine if they wish to replace the batteries or recharge the batteries from external power source 80 . Processing moves next to step 356 where a test is made on the voltage.
- the system 70 utilizes Lithium-Ion batteries, which provide near constant voltage until the end of their life, which allows the system to determine the decline of the batteries be they battery 78 or batteries within accessories. If the voltage is below a determined threshold processing moves to step 358 and system 70 is shut down. If at step 356 the voltage is sufficient, processing moves to step 360 .
- a temperature recorded by a thermal fuse is read. Processing then moves to step 362 , where a test is conducted to determine if the temperature is below a specific temperature. Lithium-Ion batteries will typically not recharge below ⁇ 5 degrees Celsius. If it is too cold, processing moves to step 358 where inductively powering rail 14 is shut down. If the temperature is within range, processing returns to step 352 .
- control path 86 provides communications between master CPU 76 and inductively powered rails 14 , 94 and 96 .
- Inductive control path 92 provides communication between an accessory such as 42 with the inductively powered rails 14 , 94 and 96 .
- the Zigbee links ( 198 , 204 ) provide for a third line of communication directly between an accessory such as 42 and master CPU 76 .
Abstract
Description
- This application is a divisional of U.S. patent application Ser. No. 12/688,256 filed Jan. 15, 2010, the contents of which are incorporated herein by reference thereto.
- Embodiments of the invention relate generally to an inductively powering rail mounted on a device such as a firearm to provide power to accessories, such as: telescopic sights, tactical sights, laser sighting modules, and night vision scopes.
- Current accessories mounted on a standard firearm rail such as a MIL-STD-1913 rail, Weaver rail, or NATO STANAG 4694 accessory rail require that they utilize a battery contained in the accessory. As a result multiple batteries must be available to replace failing batteries in an accessory. Embodiments of the present invention utilize multiple battery power sources to power multiple accessories through the use of an induction system, mounted on a standard firearms rail.
- In one embodiment of the invention a system for providing inductive power to an accessory on a firearm is provided. The system having: an inductively powering rail operatively connected to one or more batteries, the inductively powering rail comprising a plurality of inductively powering rail slots, each inductively powering rail slot having a primary U-Core, the accessory having secondary U-Cores designed to mate with each primary U-Core to provide an inductive power connection to the accessory.
- In a further embodiment, a method for providing inductive power to an accessory on a firearm is provided; the method including the steps of: detecting an accessory when attached to the firearm and providing an inductive power path with the accessory; and providing power to the accessory from a secondary source should power be required.
- In another embodiment, a method for providing power to an accessory on a firearm is provided. The method including the steps of: detecting an accessory when attached to said firearm through actuation of a magnetic switch magnetically coupled to a magnet in the accessory via a pin located in the firearm and providing a power path with said accessory; and providing power to said accessory from a secondary source of power should power be required.
- In yet another embodiment, a communication system for a powered rail of a firearm is provided. The system having: a powered rail operatively connected to a power supply; an accessory configured to releasably engage the powered rail; at least one pin located within the powered rail; at least one magnet, located within the accessory; at least one magnetic switch located within the powered rail, wherein the at least one pin is configured to magnetically couple the at least one magnet to the at least one magnetic switch when the accessory engages the powered rail.
- In yet another embodiment, a system for a powered rail of a firearm is provided. The system having: a powered rail operatively connected to a power supply; an accessory configured to releasably engage the powered rail; at least one pin located within the powered rail; at least one magnet, located within the accessory; at least one magnetic switch located within the powered rail, wherein the at least one pin is configured to magnetically couple the at least one magnet to the at least one magnetic switch when the accessory engages the powered rail.
- In still another embodiment, a method for providing power to an accessory on a firearm is provided, the method including the steps of: detecting an accessory when attached to said firearm through actuation of a magnetic switch magnetically coupled to a magnet in the accessory via a pin located in the firearm and providing a power path with said accessory; and providing power to said accessory from a secondary source of power should power be required.
- Other aspects and features of embodiments of the invention will become apparent to those ordinarily skilled in the art upon review of the following description of specific embodiments of the invention in conjunction with the accompanying figures.
- Embodiments of the present invention will now be described, by way of example only, with reference to the attached Figures, wherein:
-
FIG. 1 is a perspective view of an inductively powering rail mounted on a MIL-STD-1913 rail; -
FIG. 2 is cross section vertical view of a primary U-Core and a secondary U-Core; -
FIG. 3 is a longitudinal cross section side view of an accessory mounted to an inductively powering rail; -
FIG. 4 is a block diagram of the components of one embodiment of an inductively powered rail system; -
FIG. 5 is a block diagram of a primary Printed Circuit Board (PCB) contained within an inductively powering rail; -
FIG. 6 is a block diagram of a PCB contained within an accessory; -
FIG. 7 is a block diagram of the components of a master controller; -
FIG. 8 is a flow chart of the steps of connecting an accessory to an inductively powering rail; -
FIG. 9 is a flow chart of the steps for managing power usage; and -
FIG. 10 is a flow chart of the steps for determining voltage and temperature of the system. - Disclosed herein is a method and system for an inductively powering rail on a firearm to power accessories such as: telescopic sights, tactical sights, laser sighting modules, Global Positioning Systems (GPS) and night vision scopes. This list is not meant to be exclusive, merely an example of accessories that may utilize an inductively powering rail. The connection between an accessory and the inductively powering rail is achieved by having electromagnets, which we refer to as “primary U-Cores” on the inductively powering rail and “secondary U-Cores” on the accessory. Once in contact with the inductively powering rail, through the use of primary and secondary U-cores, the accessory is able to obtain power through induction.
- Embodiments avoid the need for exposed electrical contacts, which may corrode or cause electrical shorting when submerged, or subjected to shock and vibration. This eliminates the need for features such as wires, pinned connections or watertight covers.
- Accessories may be attached to various fixture points on the inductively powering rail and are detected by the firearm once attached. The firearm will also be able to detect which accessory has been attached and the power required by the accessory.
- Referring now to
FIG. 1 , a perspective view of an inductively powering rail mounted on a MIL-STD-1913 rail is shown generally as 10. -
Feature 12 is a MIL-STD-1913 rail, such as a Weaver rail, NATO STANAG 4694 accessory rail or the like. Sliding overrail 12 is an inductively poweringrail 14. Rail 12 has a plurality ofrail slots 16 andrail ribs 18, which are utilized in receiving an accessory. An inductively poweringrail 14 comprises a plurality ofrail slots 20,rail ribs 22 andpins 24, in a configuration that allows for the mating of accessories with inductively poweringrail 14. It is not the intent of the inventors to restrict embodiments to a specific rail configuration, as it may be adapted to any rail configuration. The preceding serves only as an example of several embodiments to which inductively poweringrail 14 may be mated. In other embodiments, the inductively poweringrail 14 can be mounted to devices having apparatus adapted to receive therail 14. -
Pins 24 in one embodiment are stainless steel pins of grade 430. When an accessory is connected to inductively poweringrail 14,pins 24 connect tomagnets 46 and trigger magnetic switch 48 (seeFIG. 3 ) to indicate to the inductively poweringrail 14 that an accessory has been connected. Should an accessory be removed the connection is broken and recognized by the system managing inductively poweringrail 14.Pins 24 are offset from the centre of inductively poweringrail 14 to ensure an accessory is mounted in the correct orientation, for example a laser accessory or flashlight accessory could not be mounted backward, and point in the user's face as it would be required to connect topins 24, to face away from the user of the firearm.Pin hole 28 accepts a cross pin that locks and secures therails - Referring now to
FIG. 2 , a cross section vertical view of a primary U-Core and a secondary U-Core is shown. Primary U-Core 26 provides inductive power to an accessory when connected to inductively poweringrail 14. Each of primary U-core 26 andsecondary U-core 50 are electromagnets. Thewire wrappings rail 14 and an accessory. Power sources for each primary U-core 26 or secondary U-core 50 may be provided by a plurality of sources. A power source may be within the firearm, it may be within an accessory or it may be provided by a source such as a battery pack contained in the uniform of the user that is connected to the firearm, or by a super capacitor connected to the system. These serve as examples of diverse power sources that may be utilize by embodiments of the invention. - Referring now to
FIG. 3 , a longitudinal cross section side view of an accessory mounted to an inductively poweringrail 14; is shown generally as 40.Accessory 42 in this example is a lighting accessory, having a forward facinglens 44. Accessory 42 connects to inductively poweringrail 14, throughmagnets 46 which engagepins 24 and triggermagnetic switch 48 to establish an electrical connection, viaprimary PCB 54, to inductively poweringrail 14. - As shown in
FIG. 3 , three connections have been established to inductively poweringrail 14 through the use ofmagnets 46. In addition, three secondary U-cores 50 connect to threeprimary U-cores 26 to establish an inductive power source foraccessory 42. - To avoid cluttering the Figure, we refer to the connection of secondary U-core 50 and primary U-core 26 as an example of one such mating. This connection between U-cores 50 and 26 allows for the transmission of power to and from the system and the accessory. There may be any number of connections between an accessory 42 and an inductively powering
rail 14, depending upon power requirements. In one embodiment each slot provides on the order of two watts. - In both the
accessory 42 and theinductively powering rail 14 are embedded Printed Circuit Boards (PCBs), which contain computer hardware and software to allow each to communicate with each other. The PCB for theaccessory 42 is shown asaccessory PCB 52. The PCB for the inductively poweringrail 14 is shown asprimary PCB 54. These features are described in detail with reference toFIG. 5 andFIG. 6 . - Referring now to
FIG. 4 a block diagram of the components of an inductively powered rail system is shown generally as 70. -
System 70 may be powered by a number of sources, all of which are controlled bymaster controller 72.Hot swap controller 74 serves to monitor and distribute power withinsystem 70. The logic of power distribution is shown inFIG. 9 .Hot swap controller 74 monitors power from multiple sources. The first in one embodiment being one or more 18.5Vbatteries 78 contained within thesystem 70, for example in the stock or pistol grip of a firearm. This voltage has been chosen as optimal to deliver two watts to each inductively poweringrail slot 20 to which anaccessory 42 is connected. This power is provided throughconductive power path 82. A second source is anexternal power source 80, for example a power supply carried external to the system by the user. The user could connect this source to the system to provide power throughconductive power path 82 to rechargebattery 78. A third source may come from accessories, which may have their ownauxiliary power source 102, i.e. they have a power source within them. When connected to the system, this feature is detected bymaster CPU 76 and thepower source 102 may be utilized to provide power to other accessories throughinductive power path 90, should it be needed. - Power is distributed either conductively or inductively. These two different distribution paths are shown as
features conductive power path 82 powers theinductively powering rail 14 whileinductive power path 90 transfers power between the inductively poweringrail 14 and accessories such as 42. -
Master CPU 76 in one embodiment is a Texas Instrument model MSP430F228, a mixed signal processor, which oversees the management ofsystem 70. Some of its functions include detecting when an accessory is connected or disconnected, determining the nature of an accessory, managing power usage in the system, and handling communications between the rail(s), accessories and the user. - Shown in
FIG. 4 are three rails. The first being the maininductively powering rail 14 andside rail units Side rail units rail unit 14 save that they are mounted on the side of the firearm and have fewer inductivelypowered rail slots 20.Side rail units master CPU 76 throughcommunications bus 110, which also provides a path for conductive power. Communications are conducted through acontrol path 86. ThusMaster CPU 76 is connected to inductively poweringrail 14 and throughrail 14 to themicrocontrollers 98 of side rails 94 and 96. This connection permits themaster CPU 76 to determine when an accessory has been connected, when it is disconnected, its power level and other data that may be useful to the user, such as GPS feedback or power level of an accessory or the system. Data that may be useful to a user is sent to externaldata transfer module 84 and displayed to the user. In addition data such as current power level, the use of an accessory power source and accessory identification may be transferred between accessories. Another example would be data indicating the range to a target which could be communicated to an accessory 42 such as a scope. - Communications may be conducted through an
inductive control path 92. Once anaccessory 42, such as an optical scope are connected to the system, it may communicate with themaster CPU 76 through the use ofinductive control paths 92. Once a connection has been made between an accessory and an inductively poweringrail inductive control path 92, through the use of primary U-cores 26 and secondary U-Cores 50. Accessories such as 42 in turn communicate withmaster CPU 76 throughrails inductive control path 92. - By the term frequency modulation the inventors mean Frequency Shift Key Modulation (FSK). A
rail accessory 42, by turning the power on and off to the primary U-core 26 and secondary U-core 50. This is achieved by applying a frequency on the order of 40 kHz. To communicate with an accessory 42 different frequencies may be utilized. By way of example 40 kHz and 50 kHz may be used to represent 0 and 1 respectively. By changing the frequency that the primary U-cores are turned on or off information may be sent to anaccessory 42. Types of information that may be sent byinductive control path 92 may include asking the accessory information about itself, telling the accessory to enter low power mode, ask the accessory to transfer power. The purpose here is to have a two way communication with anaccessory 42. - By the term load modulation the inventors mean monitoring the load on the
system 70. If an accessory 42 decreases or increases the amount of power it requires thenmaster CPU 76 will adjust the power requirements as needed. -
Accessory 104 serves as an example of an accessory, being a tactical light. It has an external power on/offswitch 106, which many accessories may have as well as asafe start component 108.Safe start component 108 serves to ensure that the accessory is properly connected and has appropriate power before turning the accessory on. -
Multi button pad 88 may reside on thefirearm containing system 70 or it may reside externally.Multi button pad 88 permits the user to turn accessories on or off or to receive specific data, for example the distance to a target or the current GPS location.Multi-button pad 88 allows a user to access features the system can provide through externaldata transfer module 84. - Referring now to
FIG. 5 a block diagram of a primary Printed Circuit Board (PCB) contained within an inductively powering rail is shown asfeature 54. - Power is received by
PCB 54 viaconductive power path 82 from master controller 72 (seeFIG. 4 ).Hot swap controller 74 serves to load theinductively powering rail 14 slowly. This reduces the amount of in rush current during power up. It also limits the amount of current that can be drawn from the inductively poweringrail 14. Conductive power is distributed to two main components, the inductively poweringrail slots 20 and themaster CPU 76 residing onPCB 54. -
Hot swap controller 74 provides viafeature 154, voltage in the range of 14V to 22V which is sent to a MOSFET andtransformer circuitry 156 for each inductively poweringrail slot 20 on inductively poweringrail 14. -
Feature 158 is a 5V switcher that converts battery power to 5V for the use ofMOSFET drivers 160.MOSFET drivers 160 turn the power on and off to MOSFET andtransformer circuitry 156 which provides the power to eachprimary U-Core 26.Feature 162 is a 3.3V Linear Drop Out Regulator (LDO), which receives its power from5V switcher 158.LDO 162 provides power tomaster CPU 76 and supporting logic within each slot. Supporting logic isMultiplexer 172 and D Flip Flops 176. - The
Multiplexer 172 and the D Flip-Flops multiplexers 172 and D Flip-Flops powered rail slot 20. This allowsmaster CPU 76 to determine which slots are enabled or disabled and to also enable or disable a slot. Themultiplexer 172 is used to select between shifting the bit from the previous slot or to provide a slot enable signal. The firstD Flip Flop 176 latches the content of theMultiplexer 172 and the second D Flip-Flop 177 latches the value of D Flip-Flop 177 if a decision is made to enable or disable a slot. -
Hall effect transistor 164 detects when an accessory is connected to inductively poweringrail 14 and enablesMOSFET driver 160. - Referring now to
FIG. 6 a block diagram of a PCB contained within an accessory such as 42 is shown generally as 52.Feature 180 refers to the primary U-Core 26 and the secondary U-Core 50, establishing a power connection between inductively poweringrail 14 andaccessory 42. Highpower ramp circuitry 182 slowly ramps the voltage up to high power load when power is turned on. This is necessary as some accessories such as those that utilize XEON bulbs when turned on have low resistance and they draw excessive current.High power load 184 is an accessory that draws more than on the order of two watts of power. - Full wave rectifier and DC/
DC Converter 186 rectifies the power fromU-Cores 180 and converts it to alow power load 188, for an accessory such as a night vision scope.Pulse shaper 190 clamps the pulse from the U-Cores 180 so that it is within the acceptable ranges formicrocontroller 98 and utilizes FSK viapath 192 to provide a modified pulse tomicrocontroller 98.Microcontroller 98 utilizes aZigbee component 198 via Universal Asynchronous Receiver Transmitter component (UART 196) to communicate between an accessory 42 andmaster controller 72. The types of information that may be communicated would include asking the accessory for information about itself, instructing the accessory to enter low power mode or to transfer power. - Referring now to
FIG. 7 , a block diagram of the components of amaster controller 72 is shown (seeFIG. 1 ) Conductive power is provided frombattery 78 viaconductive power path 82. Notswap controller 74 slowly connects the load to theinductively powering rail 14 to reduce the amount of in rush current during power up. This also allows for the limiting of the amount of current that can be drawn.Feature 200 is a 3.3 v DC/DC switcher, which converts the battery voltage to 3.3V to be used by themaster CPU 76. -
Current sense circuitry 202 measures the amount of the current being used by thesystem 70 and feeds that information back to themaster CPU 76.Master controller 72 also utilizes aZigbee component 204 via Universal Asynchronous Receiver Transmitter component (UART) 206 to communicate with accessories connected to theinductively powering rail - Before describing
FIGS. 8 , 9 and 10 in detail, we wish the reader to know that these Figures are flowcharts of processes that run in parallel, they each have their own independent tasks to perform. They may reside on any device but in one embodiment all would reside onmaster CPU 76. - Referring now to
FIG. 8 , a flow chart of the steps of connecting an accessory to an inductively powering rail is shown generally as 300. Beginning atstep 302, the main system power switch is turned on by the user through the use ofmulti-button pad 88 or another switch as selected by the designer. Moving next to step 304 a test is made to determine if an accessory, such asfeature 42 ofFIG. 4 has been newly attached to inductively poweringrail 14 and powered on or an existingaccessory 42 connected to inductively poweringrail 14 is powered on. Atstep 306 themagnets 46 on the accessory magnetize thepins 24 thereby closing the circuit on theprimary PCB 54 viamagnetic switch 48 and thus allowing the activation of the primary and secondary U-cores 26 and 50, should they be needed. This connection permits the transmission of power and communications between the accessory 42 and the inductively powering rail 14 (seefeatures FIG. 4 ). - Moving now to step 308 a communication link is established between the
master CPU 76 and the accessory via controlinductive control path 92. Processing then moves to step 310 where a test is made to determine if an accessory has been removed or powered off If not, processing returns to step 304. If so, processing moves to step 312 where power to the primary and secondary U-Cores 26 and 50 for the accessory that has been removed. -
FIG. 9 is a flow chart of the steps for managing power usage shown generally as 320. There may be a wide range ofaccessories 42 attached to an inductively poweringrail 14. They range from low powered (1.5 to 2.0 watts) and high powered (greater than 2.0 watts).Process 320 begins atstep 322 where a test is made to determine ifsystem 70 requires power. This is a test conducted bymaster CPU 76 to assess if any part of the system is underpowered. This is a continually running process. If power is at an acceptable level, processing returns to step 322. If thesystem 70 does require power, processing moves to step 324. At step 324 a test is made to determine if there is an external power source. If so, processing moves to step 326 where an external power source such as 80 (seeFIG. 4 ) is utilized. Processing then returns to step 322. If atstep 324 it is found that there is no external power source, processing moves to step 328. At step 328 a test is made to determine if there is an auxiliary power source such as feature 102 (seeFIG. 4 ). If so processing moves to step 330 where the auxiliary power source is utilized. Processing then returns to step 322. If atstep 328 it is determined that there is no auxiliary power source, processing moves to step 332. At step 332 a test is made to determine if on board power is available. On board power comprises a power device directly connected to theinductively powering rail 14. If such a device is connected to theinductively powering rail 14, processing moves to step 334 where thesystem 70 is powered by on board power. Processing then returns to step 322. If atstep 332 no on board power device is located processing moves to step 336. At step 336 a test is made to determine if there is available power in accessories. If so, processing moves to step 338 where power is transferred to the parts of the system requiring power from the accessories. Processing then returns to step 322. If the test atstep 336 finds there is no power available, then the inductively poweringrail 14 is shut down atstep 340. - The above steps are selected in an order that the designers felt were reasonable and logical. That being said, they do not need to be performed in the order cited nor do they need to be sequential. They could be performed in parallel to quickly report back to the
Master CPU 76 the options for power. -
FIG. 10 is a flow chart of the steps for determining voltage and temperature of the system, shown generally as 350. Beginning at step 352 a reading is made of the power remaining inbattery 78. The power level is then displayed to the user atstep 354. This permits the user to determine if they wish to replace the batteries or recharge the batteries fromexternal power source 80. Processing moves next to step 356 where a test is made on the voltage. In one embodiment thesystem 70 utilizes Lithium-Ion batteries, which provide near constant voltage until the end of their life, which allows the system to determine the decline of the batteries be theybattery 78 or batteries within accessories. If the voltage is below a determined threshold processing moves to step 358 andsystem 70 is shut down. If atstep 356 the voltage is sufficient, processing moves to step 360. At this step a temperature recorded by a thermal fuse is read. Processing then moves to step 362, where a test is conducted to determine if the temperature is below a specific temperature. Lithium-Ion batteries will typically not recharge below −5 degrees Celsius. If it is too cold, processing moves to step 358 where inductively poweringrail 14 is shut down. If the temperature is within range, processing returns to step 352. - With regard to communication between devices in
system 70 there are three forms of communication,control path 86,inductive control path 92 and Zigbee (198, 204).Control path 86 provides communications betweenmaster CPU 76 and inductivelypowered rails Inductive control path 92 provides communication between an accessory such as 42 with the inductively powered rails 14, 94 and 96. There are two lines of communication here, one between the rails and one between the accessories, namely controlpath 86 andinductive control path 92. Both are bidirectional. The Zigbee links (198, 204) provide for a third line of communication directly between an accessory such as 42 andmaster CPU 76. - The above-described embodiments of the invention are intended to be examples only. Alterations, modifications and variations can be effected to the particular embodiments by those of skill in the art without departing from the scope of the invention, which is defined solely by the claims appended hereto.
Claims (18)
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US9879941B2 (en) | 2018-01-30 |
US20110173865A1 (en) | 2011-07-21 |
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